Jammers are devices that disrupt the normal signal flow of devices such as cellphones, GPS receivers, and even radios. In general, it is very difficult to detect that your phone or GPS signal has been jammed. However, it is easy to see the effects of a signal jamming. When a jammer is in action nearby, you will experience poor signal quality.

A cell phone jammer is a device that hampers the normal signal reception of a cell phone. Cellphones use certain frequency bands to communicate with cell towers and base stations. Jammers transmit within these same bands, thereby creating interference. The network strength and overall calling quality are degraded to the extent that using a phone becomes nearly impossible.

Similarly, a GPS jammer is a device that emits powerful radio signals at the frequencies that the GPS receiver expects to receive from GPS satellites. This effectively drowns out the much fainter signals of the GPS.

Jammers are used for a variety of different reasons. Although historically jammers were used mainly for military and army purposes, nowadays they are commonly used by civilians as well. Some of their main uses include blocking snooping attempts, protecting private and confidential information, limiting the use of mobile phone and other radio devices, and so on. Jammers are also used in some environments where the use of a cell phone might prove to be disruptive, such as a prison, a library, or a church. More on this later.

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It is pretty hard to classify the jammers into specific categories. However, they can generally be divided into 3 main types based on the type of signal they jam – cellphone, GPS, and internet.

  • Cellphone jammers are capable of jamming all kinds of mobile signals. These jammers can usually block all frequency bands including 3G, 4G, GSM, and CDMA. Short-range jammers are often very small (small enough to fit in the palm of one's hand), whereas the more powerful, high-end models are usually bigger. 

  • GPS jammers are special signal jammers that can be used to block the transmission of any kind of location tracking service. This jammer, too, comes in all shapes and sizes. There are standalone GPS jammers that can even be as small as one’s finger! However, these jammers only cover a small area and cannot guarantee the coverage of an entire vehicle.

  • Internet Jammers block transmission of internet-like devices, such as Wi-Fi routers. These jammers also block Bluetooth signals. These signal jammers help keep the hackers away by effectively cutting off the Wi-Fi and Bluetooth communication. This helps protect your data and privacy.

Although there are differences between the types of jammers, many models are capable of jamming more than one channel. Most of the high-end models can block phone, GPS and other signals simultaneously or selectively. However, these models tend to be pricier than the single blockers.


Some factors to consider before purchasing your jammer: 

  • Cost - So, first things first, how much would it cost you? You can get the cheapest jammers (those which can only block a very specific type of signal - mobile signal, for example) for around $30 to $60. Pretty affordable, right? On the other hand, they tend to work on batteries, only for a short amount of time, and cover small area alone (around the size of a person's body). 

If you decide to buy one of the pro models, you must invest a serious amount of money behind it – at least 500$. On the upside, you don't have to worry about getting separate GPS or Wi-Fi jammers. More often than not, these models are able to block all sorts of signals including Cellular, Wi-Fi, GPS, Bluetooth, and Radio Communication.

  • Size – Portable jammers can be, surprisingly, as small as a cell phone. However, they require batteries, may work for just a short amount of time, and only cover small areas. If you want to cover larger areas, have the liberty to block signals of your choice, or jam for a longer time- you should go for one of the desktop models. These models may be bulkier, but they enable you to cover areas as large as a building and to jam specific signals rather than just blocking every signal in the area. These jammers have the strength to pack a real punch.

  • Features - Next, what to expect? As mentioned before, the cheaper models come with only the most essential features. They have the capability of blocking a single type of communication for around an hour of running time (due to battery life), but that is all. The moderately priced models are much more functional. They give the user more power by offering the choice of the type and frequency of the signal to interfere with. Moreover, battery life and the range are more superior to the smaller ones. They can last around 2-4 hours and cover about 40-80 meters of free space.

  • Installation – A jamming device usually comes unassembled, so the user must assemble it himself. Assembling the components is fairly simple and usually doesn't take more than 10-15 minutes. As the bare bones models don't offer much, all you have to do is turn them on (or simply plug them into a socket) and then they are ready to rock. The high-end models, however, need a bit of initialization and tweaking before you can get them to work.

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Jammers come handy in a number of different situations. Although their origins lie in the military and army, nowadays they are widely used in non-military circumstances as well.

  • Thwart snooping attempts - Jammers can be utilized to prevent spying or bugging attempts. Believe it or not, a jammer is found to be the most effective means of stopping someone from snooping. It is both convenient and cost-effective. It has become pretty easy for someone to conceal an audio transmitting device inside an item left at your home or workspace. A jammer can easily block the attempts of eavesdroppers by blocking the bug's receiver and preventing it from receiving commands from its operator.

  • Protection against location tracking - Location tracking can become really annoying. Often times it is even inevitable. For example, if you work as part of a delivery service, your car or truck almost definitely has a built-in GPS tracker. While having a GPS can really help you at times, it can become a nuisance pretty quickly since your manager track your location at any given moment. So, what's the solution? Use a Jammer! By transmitting noisy signals, the jammer can effectively block the GPS transmission and keep unwanted stalkers from tracking you.

  • Limit cellphone activity – Jammers are commonly used for limiting the use of a cellphone in certain areas and buildings. One of the most common places where one can witness a jammer in action is a prison. Cellphone jammers are able to prevent unwanted cellphone calls between the prisoners and the outside world, helping prevent any illegal activity.

  • Stop cheating - Jammers are also heavily used by educational institutions. By installing a signal jammer in the campus that covers nearly the whole establishment, schools and universities can successfully thwart cheaters.


It turns out that jammers are the ultimate tool for protecting both your privacy and data. With countless hackers and government snoopers eagerly waiting for you to make a tiny mistake, jammers can prove to be the insurance plan that is going to watch your back no matter what. A jamming device is, as of today, the most foolproof and cost-effective solution for preventing unwanted surveillance.